The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 23, 1997
Filed:
Jun. 07, 1995
Tomoyuki Kotani, Chigasaki, JP;
Kazuo Endo, Yokohama, JP;
Seiji Sakamoto, Machida, JP;
Takashi Harada, Yokohama, JP;
Narihiro Masuda, Yokohama, JP;
Masashi Inagaki, Tsukui-gun, JP;
Chikakazu Kawaguchi, Nagahama, JP;
Diafoil Hoechst Company, Ltd., Tokyo, JP;
Abstract
A biaxially oriented polyester film for a magnetic recording medium contains: 1) at least two different sizes of synthetic calcium carbonate particles; and 2) aluminum oxide particles to produce a film with excellent surface uniformity, running properties, and slittability wherein the film generates few scratches and low amounts of abrasion dust. The synthetic calcium carbonate particles are surface treated with a polycarboxylic acid, followed by treatment with a phosphorus compound. The biaxially oriented polyester film can comprise a layer in a multilayer film.